cxxx 



syupatrically polymorpliic species. Earlier in tliis address 

 I have mentioned the Agaristid Immetalia saturata as a day- 

 flying polymorphic species. This moth occurs in Southern 

 New Guinea in three individual forms, both sexes being either 

 white-banded on both wings, or white-banded on the fore-wing 

 and orange-banded on the hind-wing, or orange-banded on 

 both wings, a sharply marked trichromatism, a fourth form, 

 with the band of the hind- wing replaced by a few white scales, 

 being represented by a single female in my collection. In 

 Northern New Guinea, at a low altitude, the c? is always 

 white, but the $ is either white-banded like the c^, or white- 

 banded on the fore-wing and orange-banded on the hind-wing, 

 or orange-banded on both wings. In Eastern New Guinea 

 (in the district around the Huon Gulf), and on the islands off 

 the north-east coast, both sexes are always orange-banded. 

 On the Southern Moluccas — we have only a few specimens 

 from Aru and Key, and do not know the extent of variation 

 on these islands — the band of the hind-wing is always missing, 

 at least in the lowlands, the band of the fore- wing being white 

 in the Ceram c? and either white or orange in the Ceram ?, 

 white in both sexes on Amboina, and orange in both sexes 

 on Burn. In the Northern Moluccas both wings have a band, 

 which is always orange in both sexes. That is to say : a 

 species tetramorphic in one district appears in another district 

 monomorphic in the cj, trimorphic in the ?, in other places 

 sexually dimorphic, or entirely monomorphic. A somewhat 

 similar case is that of Papilio clytia. In India and Indo- 

 China it occurs in two main forms, each individually variable, 

 a streaked form and a brown one ; in North India occasionally 

 intermediates appear which are not known from any other 

 district. In the Andamans occurs only a streaked race, on 

 Palawan a monomorphic brown race or, if you like, species, 

 and on Timor and neighbouring islands the species is rej)re- 

 sented by a streaked Papilio, the islands in between and 

 Malacca being inhabited by the specifically distinct, though 

 closely allied, Papilio paradoxus, the mimic of various Euploeas. 

 As a third example of polymorphism I mention Papilio 

 menmon. In this species the $ is of particular interest, though 

 the (5" also varies geographically. The point to which I wish 



